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Archived

Avalanche Forecast

Mar 16th, 2012–Mar 17th, 2012
Alpine
4: High
The avalanche danger rating in the alpine will be high
Treeline
3: Considerable
The avalanche danger rating at treeline will be considerable
Below Treeline
3: Considerable
The avalanche danger rating below treeline will be considerable
Alpine
3: Considerable
The avalanche danger rating in the alpine will be considerable
Treeline
3: Considerable
The avalanche danger rating at treeline will be considerable
Below Treeline
3: Considerable
The avalanche danger rating below treeline will be considerable
Alpine
3: Considerable
The avalanche danger rating in the alpine will be considerable
Treeline
3: Considerable
The avalanche danger rating at treeline will be considerable
Below Treeline
3: Considerable
The avalanche danger rating below treeline will be considerable

Regions: Glacier.

Orange does not mean go! Natural activity is expected to taper off as inputs decrease. Skier triggering remains likely, with very high consequences.Drive past the Grizzly slide path (Hermit Meadows) to be reminded of the potential of these layers.

Avalanche Problems

Wind Slabs

Southerly winds have accompanied this weeks storm. Windslabs exist at ridgecrests. These may overlie lower density snow and be triggerable, potentially stepping down to deeper instabilities. Wind transport has loaded slopes and cornices are growing.

Aspects: North, North East, East, South East.

Elevations: Alpine, Treeline.

Likelihood: Likely

Expected Size: 2 - 3

Persistent Slabs

The Feb 9 persistent layer is down 1.5 to 2m. and remains reactive. Another climax avalanche was reported yesterday: a natural off of Teddybear ridge was 1.5m deep, logged mature timber, and hit the standard uptracks to grizzly shoulder and balu.

Aspects: All aspects.

Elevations: All elevations.

Likelihood: Possible - Likely

Expected Size: 3 - 4

Storm Slabs

In the past week, 80cm of new snow, mild temperatures and high winds have formed a cohesive storm slab. Within the slab are a series of layers that are stubborn, and most likely to be triggered on convexities. Below 1500m it sits on a rain crust.

Aspects: All aspects.

Elevations: All elevations.

Likelihood: Likely

Expected Size: 2 - 3